For my maintenance of way scene I wanted some switch frogs to have lying around near the piles of ties and rail. I had a couple of options but none were great: I could sacrifice an O scale 2-rail switch just for the frog casting; I could sacrifice a 3-rail switch for the frog but it likely wouldn't look very realistic, I could purchase some Proto 48 scale frog castings, or I could try and build one up from styrene.
I asked on the O Gauge Railroading magazine online forum if anyone was aware of 3D designs for frog castings and someone there ("LT1Poncho") offered to draw some up for me. Wow! I couldn't turn that down. They were done quickly and he mailed four to me to use.
I washed them with soap and water and painted them rusty brown. Then, they were oversprayed with a mist of matte dark brown. Finally, they were attached to the layout on top of some stripwood.
They are perfect for the scene!